Stock-feeding collet



Aug. 5, 1930. A.' NAL-:RT 1,772,362,

STOCK FEEDING COLLET .,Fiie'd'nec. 17, 192s lINVENIOR.

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` BY v 'i' ATTORNEY.'

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ALEXIS NAERT, or DETROIT", MICHIGAN STOCK-Fiamme 'conter Application IedDecemberrl?, 1928.V Serial No. 326,580.

My invention relates to a new and useful improvement in a stock feedingcollet adapted for use particularly for feeding stock to screw machines.Y

lt is an object of the present invention to provide a collet which willeffectively grip the stock when feeding it into the machine and releasewhen moving to a rearward position for engaging the stock at anotherpoint.

It is another object of the present invention to provide a stock feedingcollet of this class which will be simple in structure, economical ofmanufacture, and highly eflicient and durable in use.

Another object of the invention is the provision of a stock feedingcollet having a minimum number of parts and one which is easily andquickly assembled.v

Other objects will appear hereinafter. The invention consists in thecombination and arrangement of `parts hereinafter described yandclaimed. Theinvention will be best understood from a reference to theaccompanying drawings which form apart of this specification, and inwhich,

Fig. 1 is aside elevational view of the invention.

Fig. 2 is a longitudinal, vertical sectional view of the invention.

Fig. 3 is a sectional view taken on line 3 3 of Fig. 2.

The invention is illustrated in the drawing as attached to a tube 7which is commonly found on screw machines and utilized for assisting infeeding the stock into the machine.

The invention comprises a cylindrical portion 8 having the reducedthreaded portion 9 which is threaded into the tube 7 and through whichextends the bore 10 which is enlarged at 11 to provide a sleeve 12 whichis threaded at one end. This sleeve is provided with a plurality ofaxially directed slits Iso that dirt and other foreign material may notaccumulate in the sleeve 12. Positioned inthe Withdrawal rearwardly onthe stock'of the mechanism of this class, a durable structure 8- sleeve12 is a coil spring 14 adapted to e1n` brace the work piece or stock 21which is 'to beV fed in the work machine. Engaging against one end ofthe spring 14 and loosely positioned in the sleeve 12, is acollar 17having its end face 18 tapered and adapted to engage the tapered ends ofthe semi-cylindrical gripping members 15 and 16 which are also looselypositioned in the sleeve-12. AThese gripping members when engaging eachother at their edges, form a cylinder of' less diameter than the insidediameter of the sleeve 12. Threaded into the open end of the sleeve 12is a plug 1 9 having its inner face tapered as at 20 for engaging thetapered ends .of the gripping members 15 and 16.

In use, lwhen the'parts are assembled as shown inFig. 2 and the stock`21 projected therethrough, the engagement of the inclined faces 20 and18 with the tapered ends of the gripping members' 15 and'16 willforcethem .inwardly so as to securely clamp the stock 21. The spring 14,through the pressure on .the collar17 `serves to retain these membersnormally in clamping position and when the plug 19 is threaded inwardlysufficiently to adjust the tension of the spring 14 to the desiredstock, the gripping members 15 and 16 Vwillgrip the stock sufficientlyto ffeed it into the machine and at the same time permit the feeding'.mechanism for obtaining l another grip on the stock. v n y `With a stockfeeding mechanism as now used, particularly where a spring grippingmember is provided by slitting, much delay Vis encountered because offracture in the gripping mechanism. With a stock feeding is providedwhich will successfully perform its function undernormal conditionswithout repair or adjustment. By threading the plug 19` inwardly oroutwardly, the tension of the springr 14 may be regulated so thatthe 90Gil degree of clamping of the gripping members 15 and 16 may bedetermined.

Y lVhile I have illustrated and described the preferred form of myinvention, I do not wish to limit myself to the precise details ofstructure shown but desire to avail myself of such variations andmodifications as come within the scope of the appended claims.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A stock feeding mechanism of the class described, comprising: asleeve bearing meinber; a coil spring loosely positioned in said sleeve;a collar axially slidable in said sleeve Vand engaging at one face oneend of said spring, the opposite face of said collar being inclinedinwardly towar l its center; a pair of semi-cylindrical gripping membersVloosely positioned in said sleeve and having tapered ends'and eachengaging at one end on its periphery the inclined face of said collar;and means insertable in said sleeve for engaging the per-ipheries of theopposite ends of said gripping members.Y

2. At stock feeding mechanism of the class described, comprising: asleeve bearing member; a coil spring loosely positioned in said sleeve;a collar axially slidable in said sleeve and engaging at one face oneend of said spring, the opposite face of said collar being inclinedinwardly toward its center; a pair of semi-cylindrical gripping membersloosely positionedv` in said sleeve and having tapered ends and eachengaging at one end on its eriphery the inclined face of said collar;

V'an' means insertable into said sleeve havingyan' inner face inclinedinwardly toward its center for engaging the peripheries of the oppositeendsy of said gripping members.

3. A stock feeding mechanism of the 'class described, comprising: asleeve bearing meinber; a spring positioned in said sleeve; a collaraxially sli'dable in said sleeve and engaging at one face one end ofsaid spring, the opposite face of said collar being inclined inwardlytoward its center; a pair of gripping members loosely positioned in saidsleeve and having tapered ends and engaging on its periphery at one endthe inclined face of said colla-r; va plug threaded into said sleevehaving its inner face inclined inwardly toward the center and engageablewith'the periphleries of the ends of said gripping members.

4. A. stock feeding mechanism of the class described, comprising: acylindrical member having a bore formed therein, said bore beingenlarged to provide a sleeve; a coil spring loosely positionediin saidsleeve; an angular member loosely positioned in said sleeve and engagingat one face one end of said spring,

ythe opposite face being inclined inwardly toward its center; a pair ofsemi-cylindrical gripping members having tapered ends and inserted insaid sleeve and engaging at one ALEXIS NAERT.

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